This visualization shows the distribution of student anxiety levels as a pie chart, with each slice representing the proportion of students at a specific anxiety level. It uses d3.pie() and d3.arc() to render the pie, d3.scaleOrdinal() to assign colors, and d3.rollup() to count students in each anxiety category. Hovering displays a tooltip with the count and percentage, while clicking a slice populates a list of students in that anxiety level, showing their age, gender, sleep patterns, and stress levels. The data comes from a CSV file loaded via d3.csv().